CVE-2021-20267

openstack-neutron: Anti-spoofing bypass using Open vSwitch

Published May 28, 2021 CVSS 3.1 · 7.1 High EPSS 1.0% KEV · Not listed
Description
A flaw was found in openstack-neutron's default Open vSwitch firewall rules. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-4983-1 neutron security update
EUVD EUVD EUVD-2021-0142 A flaw was found in openstack-neutron's default Open vSwitch firewall rules. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.
Github GHSA Github GHSA GHSA-w8hx-f868-pvch Openstack Neutron has Insufficient Verification of IPv6 addresses
Ubuntu USN Ubuntu USN USN-6067-1 OpenStack Neutron vulnerabilities
History

No history.

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Aug 3, 2024, 5:37 PM
Reserved
Dec 17, 2020, 12:00 AM
Status
Modified
Published
May 28, 2021, 7:15 PM
Modified
Jun 17, 2026, 3:33 AM
Severity
Moderate
Public date
Nov 5, 2020, 12:00 AM